Cakradatta (Cikitsasangraha) 76.27

76.27

svasthe ca dvyantaraṃ dadyādātṛpteriti yojayet .
prakāśakṣamatā svāsthyaṃ viśadaṃ laghu locanam .. 27 ..

and in a healthy person, one should administer it with two days' interval, applying it until satisfaction is reached. / Tolerance to light, health, clarity, and lightness of the eye